ADA Ramp Calculator

Ramp Calculation Formulas:

\[ \text{run} = \text{rise} \times 12 \] \[ L = \sqrt{\text{rise}^2 + \text{run}^2} \]

Run (horizontal distance):

Ramp Length:

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1. What is an ADA Ramp Calculator?

Definition: This calculator determines compliant ramp dimensions according to ADA (Americans with Disabilities Act) standards.

Purpose: It helps architects, builders, and property owners design wheelchair-accessible ramps with the required 1:12 slope ratio.

2. How Does the Calculator Work?

The calculator uses these formulas:

\[ \text{run} = \text{rise} \times 12 \] \[ L = \sqrt{\text{rise}^2 + \text{run}^2} \]

Where:

\( \text{rise} \) — Vertical height (inches)
\( \text{run} \) — Horizontal distance (inches)
\( L \) — Ramp length (inches)

Explanation: ADA requires a maximum slope of 1:12 (1 inch rise per 12 inches run). The ramp length is calculated using the Pythagorean theorem.

3. Importance of ADA Ramp Compliance

Details: Proper ramp dimensions ensure accessibility for wheelchair users and compliance with federal accessibility laws.

4. Using the Calculator

Tips: Simply enter the vertical rise in inches. The calculator will determine the required run and ramp length.

5. Frequently Asked Questions (FAQ)

Q1: What is the maximum rise before a landing is required?
A: ADA requires a landing every 30 inches of rise (30" maximum between landings).

Q2: Can the slope be steeper than 1:12?
A: No, 1:12 is the maximum slope allowed by ADA. Some exceptions exist for existing structures (max 1:10) but not for new construction.

Q3: What about ramp width requirements?
A: ADA requires a minimum clear width of 36 inches between handrails.

Q4: How do I convert inches to feet?
A: Divide inches by 12. For example, 120 inches = 10 feet.

Q5: Are handrails required?
A: Yes, for ramps with a rise greater than 6 inches or horizontal projection greater than 72 inches.